Description

Checks whether the attribute was passed to this tag.

Returns True if the attribute is available; otherwise returns False.

Category

Request interface

Syntax

public boolean attributeExists(String name)

See also

getAttribute, getAttributeList

Parameters

Example

The following example checks whether the user passed an attribute named DESTINATION to the tag; if not, it throws an exception:

if ( ! request.attributeExists("DESTINATION") )
{
    throw new Exception( 
    "Missing DESTINATION parameter",
    "You must pass a DESTINATION parameter in "
    "order for this tag to work correctly." ) ;
} ;